《机械制图》是一种工程技术语言,人们利用它来绘图和看图,它是理工科学生的专业基础课,主要表达机械设备的结构形状、材料、装配关系、用途等等。它的核心内容就是利用三个不同方向的平行光线垂直照射机件得到投影,并将其转化为视图的方法,把立体变成平面。在教学过程中,主要 Mechanical drawing is an engineering language that people use to draw and view drawings. It is a specialized basic course for science and engineering students. It mainly expresses the structural shapes, materials, assembly relations, uses and so on of mechanical equipment. Its core content is the use of three different directions of the parallel rays of light vertical projection device, and its conversion into a view of the method, the three-dimensional into a plane. In the teaching process, mainly